[HN Gopher] Internal Ocean Tides (2021)
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       Internal Ocean Tides (2021)
        
       Author : raattgift
       Score  : 18 points
       Date   : 2024-12-12 21:06 UTC (1 days ago)
        
 (HTM) web link (svs.gsfc.nasa.gov)
 (TXT) w3m dump (svs.gsfc.nasa.gov)
        
       | hbrav wrote:
       | This is very cool. I did my PhD in tidal interactions, but in the
       | context of stars and giant planets - bodies that can typically be
       | treated as having spheroidal symmetry. (In fact, one thing I was
       | looking at was the corrections as you moved away from as
       | assumption of spherical symmetry to include the equatorial
       | bulge.)
       | 
       | The Earth's tides are far more complex because of the shape of
       | the ocean basins, and it has quite a high dissipation rate. I'm
       | not sure how much the internal tide contributes to that, but I
       | suspect a lot given that the amplitude (tens of meters) is much
       | greater than the surface displacement.
       | 
       | Anyway, gorgeous visualisation!
        
       | mmooss wrote:
       | > Within the water column the vertical displacement of water in
       | these waves is large, often tens of meters, and even larger in a
       | few places.
       | 
       | > Their characteristic wavelength - about 50 to 100 km from peak
       | to trough
       | 
       | Do we see floating underwater objects, such as fish or other
       | organisms (many of which mostly float and don't propel
       | themselves) or even submarines, being propelled by this current?
       | How much power does it have? Or maybe the effects are too subtle
       | locally due to such long wavelengths?
        
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       (page generated 2024-12-13 23:01 UTC)